/Engine/Source/Runtime/Engine/Classes/GameFramework/CharacterMovementComponent.h
Return true if the 2D distance to the impact point is inside the edge tolerance (CapsuleRadius minus a small rejection threshold). Useful for rejecting adjacent hits when finding a floor or landing spot.
virtual bool IsWithinEdgeTolerance ( const FVector & CapsuleLocation, const FVector & TestImpactPoint, const float CapsuleRadius ) const